Introduce LineaExtraDataPlugin

Signed-off-by: Fabio Di Fabio <[email protected]>

arithmetization/src/main/java/net/consensys/linea/extradata/LineaExtraDataHandler.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright Consensys Software Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+ * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package net.consensys.linea.extradata;
+
+import lombok.extern.slf4j.Slf4j;
+import org.apache.tuweni.bytes.Bytes;
+import org.hyperledger.besu.plugin.data.AddedBlockContext;
+import org.hyperledger.besu.plugin.services.BesuEvents;
+
+@Slf4j
+public class LineaExtraDataHandler implements BesuEvents.BlockAddedListener {
+  @Override
+  public void onBlockAdded(final AddedBlockContext addedBlockContext) {
+    final var blockHeader = addedBlockContext.getBlockHeader();
+    final var extraData = blockHeader.getExtraData();
+
+    if (!Bytes.EMPTY.equals(extraData)) {
+      final byte version = extractVersion(extraData);
+      switch (version) {
+        case 1:
+          parseVersion1(extraData);
+          break;
+        default:
+          log.warn(
+              "unsupported extra data version: {}, raw extra data field",
+              version,
+              extraData.toHexString());
+      }
+    }
+  }
+
+  private void parseVersion1(final Bytes extraData) {
+    log.info("Found extra data version 1: {}", extraData.toHexString());
+  }
+
+  private byte extractVersion(final Bytes extraData) {
+    return extraData.get(0);
+  }
+}

arithmetization/src/main/java/net/consensys/linea/extradata/LineaExtraDataPlugin.java

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+/*
+ * Copyright Consensys Software Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+ * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package net.consensys.linea.extradata;
+
+import java.util.Optional;
+
+import com.google.auto.service.AutoService;
+import lombok.extern.slf4j.Slf4j;
+import net.consensys.linea.AbstractLineaRequiredPlugin;
+import org.hyperledger.besu.plugin.BesuContext;
+import org.hyperledger.besu.plugin.BesuPlugin;
+import org.hyperledger.besu.plugin.services.BesuEvents;
+
+/** This plugin registers handlers that are activated when new blocks are imported */
+@Slf4j
+@AutoService(BesuPlugin.class)
+public class LineaExtraDataPlugin extends AbstractLineaRequiredPlugin {
+  public static final String NAME = "linea";
+  private BesuEvents besuEventsService;
+
+  @Override
+  public Optional<String> getName() {
+    return Optional.of(NAME);
+  }
+
+  @Override
+  public void doRegister(final BesuContext context) {
+    besuEventsService =
+        context
+            .getService(BesuEvents.class)
+            .orElseThrow(
+                () -> new RuntimeException("Failed to obtain BesuEvents from the BesuContext."));
+  }
+
+  @Override
+  public void beforeExternalServices() {
+    super.beforeExternalServices();
+    besuEventsService.addBlockAddedListener(new LineaExtraDataHandler());
+  }
+}